Java FloatBuffer limit()用法及代碼示例

java.nio.FloatBuffer類的limit()方法用於修改此FloatBuffer的限製。此方法將要設置的限製作為參數，並將其設置為此Buffer的新限製。如果此緩衝區的標記已經定義並且大於新指定的限製，則不會設置並丟棄此新限製。

用法:

public final FloatBuffer limit(int newLimit)

參數：該方法采用整數類型的一個參數newLimit，該參數表示要設置為緩衝區的新限製的限製。

返回值：在將指定的新限製設置為該緩衝區的新限製之後，該方法將返回此緩衝區。

以下示例說明了limit()方法：

範例1：

// Java program to demonstrate 
// limit() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // defining and allocating FloatBuffer 
        // using allocate() method 
        FloatBuffer floatBuffer 
            = FloatBuffer.allocate(4); 
  
        // put float value in FloatBuffer 
        // using put() method 
        floatBuffer.put(20.5f); 
        floatBuffer.put(30.5f); 
  
        // print the float buffer 
        System.out.println( 
            "FloatBuffer before "
            + "setting buffer's limit: "
            + Arrays.toString( 
                  floatBuffer.array()) 
            + "\nPosition: "
            + floatBuffer.position() 
            + "\nLimit: "
            + floatBuffer.limit()); 
  
        // Limit the floatBuffer 
        // using limit() method 
        floatBuffer.limit(1); 
  
        // print the float buffer 
        System.out.println( 
            "\nFloatBuffer after "
            + "setting buffer's limit: "
            + Arrays.toString( 
                  floatBuffer.array()) 
            + "\nPosition: "
            + floatBuffer.position() 
            + "\nLimit: "
            + floatBuffer.limit()); 
    } 
}

輸出：

FloatBuffer before setting buffer’s limit:
[20.5, 30.5, 0.0, 0.0]
Position: 2
Limit: 4

FloatBuffer after setting buffer’s limit:
[20.5, 30.5, 0.0, 0.0]
Position: 1
Limit: 1

範例2：

// Java program to demonstrate 
// limit() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // defining and allocating FloatBuffer 
        // using allocate() method 
        FloatBuffer floatBuffer 
            = FloatBuffer.allocate(5); 
  
        // put float value in FloatBuffer 
        // using put() method 
        floatBuffer.put(20.5f); 
        floatBuffer.put(30.5f); 
        floatBuffer.put(40.5f); 
  
        // mark will be going to 
        // discarded by limit() 
        floatBuffer.mark(); 
  
        // print the float buffer 
        System.out.println( 
            "FloatBuffer before "
            + "setting buffer's limit: "
            + Arrays.toString( 
                  floatBuffer.array()) 
            + "\nPosition: "
            + floatBuffer.position() 
            + "\nLimit: "
            + floatBuffer.limit()); 
  
        // Limit the floatBuffer 
        // using limit() method 
        floatBuffer.limit(4); 
  
        // print the double buffer 
        System.out.println( 
            "\nFloatBuffer before "
            + "setting buffer's limit: "
            + Arrays.toString( 
                  floatBuffer.array()) 
            + "\nPosition: "
            + floatBuffer.position() 
            + "\nLimit: "
            + floatBuffer.limit()); 
    } 
}

輸出：

FloatBuffer before setting buffer’s limit:
[20.5, 30.5, 40.5, 0.0, 0.0]
Position: 3
Limit: 5

FloatBuffer before setting buffer’s limit:
[20.5, 30.5, 40.5, 0.0, 0.0]
Position: 3
Limit: 4

參考：https://docs.oracle.com/javase/9/docs/api/java/nio/FloatBuffer.html#limit-int-

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 FloatBuffer limit() Method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。